Pulley-fastening.



No. 650,|541 Patentod May 22, 1900.

A OWENS PULLEY FASTENING (Apphcat on filed Feb 12 1900) (N0- Model.)

e ijII- -E M Inventor.

. M X K Airy &

witnesses:

Di: norms mks ocn. morourn UNITED STATES PATENT ()FFICE.

AROHIBALD OWENS, OF FLORIDA, OIlIO.

PULLEY-FASTENING.

SPECIFICATION forming part'of Letters Patent NO. 650,154, dated May2?,1900. Application filed February 12, 1900- erial No. 4,865. (Nomodel.)

T0 (0% evil/07a it may concern:

Be it known that I, ARoHIBALD OWENS, a citizen of the United States,residing at Florida, Henry county, Ohio, have invented cer tain new anduseful Improvements in Pulley- Fastenings, of which the following isaspect fication.

Heretofore pulleys have usually been secured to their shafts either bymeans of keys engaging keyways in the shaft and in the hub of the pulleyor. by set-screws passing through the hub of the pulley and projectingagainst the shaft. To permit a pulley to be engaged with its shaft atany point along the length of the shaft by the former method requires akeyway to be cut the whole length of the shaft, which is very expensive,especially in line-shafting. To avoid this, short keyways have been cutin the shaft atthe points where the pulleys are to be applied; but whenan additional pulley is to be added to the shaft the labor, expense, anddelay attendant upon the cutting of an additional short keyway aregreat. The use of setscrews is found to be unsatisfactory except wherethe strains are light, because of the slight area of contact between thescrew and the shaft.

My invention relates to and its object is to provide a cheap, simple,and efficient device for securing a pulley upon its shaft, which deviceshall overcome the objections here indicated, and more particularly toprovide means whereby a pulley may be secured to its shaft withoutcutting any keyway in the shaft and whereby a pulley may be easily andreadily secured at any point along the shaft as firmly and rigidly asmay be desired. I attain these objects by means of the devices andarrangement of parts hereinafter described, and shown and illustrated inthe accompanying drawings, made part hereof, in which Figure l is atransverse sectional view of a pulley-hub engaged upon its shaft bymeans of my device; Fig. 2, a central longitudinal sectional view of thesame; Fig. 3, a side elevation of the spring compression-bar hereinafterreferred to; Fig. 4, an end elevation of the same, and Fig. 5 an endelevation of a modified form of said compression-bar.

Like letters of reference indicate like parts throughout the drawings.

In the drawings, a is the shaft, and b the hub of the pulley to besecured upon the shaft. In the face of the bore of the hub and parallelwith the axis thereof is cut or formed a channel or groove c. Throughthe hub radially are screw-threaded holes, which lead into the channelor groove 0. In these screwthreaded holes are set-screws d.

e is a bar formed, preferably, of resilient tool-steel. This bar ispreferably of the same length as the slot, although it may be longer.The bar e is somewhat thicker at its middle than at its ends and isbowed at its middle inwardly toward the shaft. That side of the barwhich is next to the shaft is concaved laterally in the arc of a circleof shorter radius than the circle'of the shaft, so that the margins ofthe bar form angles or edges which may engage the shaft.

The inner face of the bar 6 may, instead of being concave incross-section, be longitudinally corrugated, as illustrated in Fig. 5.

The operation of my device is as follows: The pulley being upon itsshaft at the desired point and screws (1 being partly withdrawn, the bar6, with its curved or corrugated face turned toward the shaft, isslipped longitudinally into the slot 0. The screws d are now set upagainst the bar. The middle or inwardly-bowed portion of the bar firstpresses against the shaft a, and as the screws (1 are set up theextremities of the bar yield and the bar throughout its whole length isstraightened and brought into close contact with the shaft, clamping andgripping the shaft tightly between the bar and the opposite side of thehub, thus bringing the pulley and shaft into such close union that theyinvariably revolve together.

Instead of the set-screws d cotters or wedges may be employed to forcethe compressionbar into a right line and against the shaft; but thiswould of course be the obvious mechanical equivalent of the set-screwsd, which in practice are found preferable.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s

1. In a pulley-fastening, a bar of resilient metal having its inner facelongitudinally va longitudinal groove in its inner face, a bowed'orcurved, means for forcing said bar bowed compression-bar of resilientmetalin inwardly toward the axis of the pulley, and" said groove, andset-screws projecting in- I5 means for holding said bar parallel withthe wardly against said bar, whereby, by the ac- 5 axis of the pulley. Ition of said set-screws, the bowed compres- 2. In a pulley-fastening, 'acompression-bar sion-bar is forced into contact with the shaft ofresilient metal, havingits innerface curved throughout the length ofsaid compressionor bowed longitudinally, and longitudinal bar.

projections upon the inner face of said com- ARCHIBALD OWENS. 1opression-bar. In presence of 8. A pulley-fastening comprising a shaft,L. E. BROWN,

a pulley thereon having a hubprovided with F. M. DOTSON.

